ASP.NET

public ActionResult ShowLegalEntityReport(string legalEntityNumber, string lENumOperator, string legalEntityName, string lENameOperator
    , string taxId, string taxIdOperator, string submittingCounty, string submCountyOperator, string legalEntityCity, string lECityOperator)
{
    ReportViewer reportViewer = new ReportViewer();
    reportViewer.ProcessingMode = ProcessingMode.Local;
    reportViewer.SizeToReportContent = true;
    reportViewer.Width = Unit.Percentage(900);
    reportViewer.Height = Unit.Percentage(700);

    DataRetrieveServiceClient drsc = new DataRetrieveServiceClient();

    DataTable dt = CommonFunctions.ToDataTable(drsc.GetLegalEntityReport(legalEntityNumber, lENumOperator, legalEntityName, lENameOperator, taxId, taxIdOperator
        , submittingCounty, submCountyOperator, legalEntityCity, lECityOperator));

    reportViewer.LocalReport.ReportPath = Request.MapPath(Request.ApplicationPath) + @"\Reports\LegalEntityReport.rdlc";
    reportViewer.LocalReport.DataSources.Add(new ReportDataSource("LegalEntityDataSet", dt));

    ViewBag.ReportViewer = reportViewer;


    return View();
}

@using ReportViewerForMvc; 
@{
    ViewBag.Title = "Show Legal Entity Report";
    Layout = "~/Views/Shared/_LayoutFinal.cshtml";
}

@Html.ReportViewer(ViewBag.ReportViewer as Microsoft.Reporting.WebForms.ReportViewer)

using (SqlDataReader sdr = cmd.ExecuteReader())
                {
                    while (sdr.Read())
                    {

                        if (string.IsNullOrEmpty(sdr["Code"].ToString()))
                        {
                            C_E = "0";
                            this.Update(C_E);
                            //ViewBag.Message = "cero";
                        }
                        else
                        {
                            C_E = sdr["Code"].ToString();
                            this.Update(C_E);
                            // ViewBag.Message = C_E;
                        }


                    }

I am trying to create to create two dynamic TextBoxes on Button click1.  The first time i click i get 2. 

The second time 4 ans so on when I only want two (2)



protected void Page_PreInit(object sender, EventArgs e)
{
List<string> keys = Request.Form.AllKeys.Where(key => key.Contains("txtDynamic")).ToList();
int i = 1;
foreach (string key in keys)
{
this.CreateTextBox("txtDynamic" + i);
i++;
}

}

protected void Button1_Click(object sender, EventArgs e)
{
int index = pn1TextBoxes.Controls.OfType<TextBox>().ToList().Count + 1;
this.CreateTextBox("txtDynamic" + index);


}

private void CreateTextBox(string id)
{
for (int i = 1; i <= 2; i++)
{
TextBox txt = new TextBox();
txt.ID = id + i.ToString();
txt.TextMode = TextBoxMode.MultiLine;
txt.Height = 60;
txt.Width = 300;
pn1TextBoxes.Controls.Add(txt);
} 
Literal lt = new Literal();
lt.Text = "<br/>";
pn1TextBoxes.Controls.Add(lt);
}